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Are you using the lower mechbox from a Cansoft ICS? If so and you got one of the 2006 lower receivers, it won't fit properly.
I had similar issues with mine (I managed to secure a lower and bought a clear to complete it). You can try to loosen the grip screws before closing the rifle, then tighten and test. If it solves it, it's because the lower mechbox sits too low in the receiver and the grip pulls it down.
Are you sure it's the piston getting damaged? Recent ICS gears have issues with the bevel separating and causing a screeching noise. If your shimming is not good enough, the upper can force the lower a bit and cause more friction, letting the bevel slip as described.
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Originally Posted by Drake
Damnit, don't make me add "no discussing temporal paradoxes" to the rules or I'll go back in time and ban you last week.
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